參數資料
型號： PIC16LF721-E/SO
廠商： Microchip Technology
文件頁數： 78/135頁
文件大?。?/td> 0K
描述： MCU PIC 3.5KB FLASH 20SOIC
標準包裝： 38
系列： PIC® XLP™ 16F
核心處理器： PIC
芯體尺寸： 8-位
速度： 16MHz
連通性： I²C，SPI，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數： 17
程序存儲器容量： 7KB（4K x 14）
程序存儲器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 3.6 V
數據轉換器： A/D 12x8b
振蕩器型： 內部
工作溫度： -40°C ~ 125°C
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
包裝： 管件
2010-2011 Microchip Technology Inc.
Preliminary
DS41430C-page 47
PIC16(L)F720/721
6.0
I/O PORTS
There are as many as eighteen general purpose I/O
pins available. Depending on which peripherals are
enabled, some or all of the pins may not be available as
general purpose I/O. In general, when a peripheral is
enabled, the associated pin may not be used as a
general purpose I/O pin.
6.1
PORTA and the TRISA Registers
PORTA is a 8-bit wide, bidirectional port. The
corresponding data direction register is TRISA
(Register 6-2). Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., disable the
output driver). Clearing a TRISA bit (= 0) will make the
corresponding PORTA pin an output (i.e., enables
output driver and puts the contents of the output latch
on the selected pin). Example 6-1 shows how to
initialize PORTA.
Reading the PORTA register (Register 6-1) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then
written to the PORT data latch.
The TRISA register (Register 6-2) controls the PORTA
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISA register are maintained set when using them as
analog inputs. I/O pins configured as analog input always
read ‘0’.
EXAMPLE 6-1:
INITIALIZING PORTA
6.1.1
WEAK PULL-UPS
Each of the PORTA pins has an individually
configurable internal weak pull-up. Control bits
WPUA<5:0> enable or disable each pull-up (see
Register 6-5). Each weak pull-up is automatically
turned off when the port pin is configured as an output.
All pull-ups are disabled on a Power-on Reset by the
RABPU bit of the OPTION_REG register.
6.1.2
INTERRUPT-ON-CHANGE
All of the PORTA pins are individually configurable as
an interrupt-on-change pin. Control bits IOCA<5:0>
enable or disable the interrupt function for each pin
(see Register 6-6). The interrupt-on-change feature is
disabled on a Power-on Reset.
For enable interrupt-on-change pins, the present value
is compared with the old value latched on the last read
of PORTA to determine which bits have changed or
mismatched the old value. The ‘mismatch’ outputs of
the last read are OR’d together to set the PORTA
Change Interrupt Flag bit (RABIF) in the INTCON
register. This interrupt can wake the device from Sleep.
The user, in the Interrupt Service Routine, clears the
interrupt by:
1.
Any read or write of PORTA. This will end the
mismatch condition.
2.
Clear the flag bit RABIF.
A mismatch condition will continue to set flag bit RABIF.
Reading or writing PORTA will end the mismatch
condition and allow flag bit RABIF to be cleared. The
latch holding the last read value is not affected by a
MCLR or Brown-out Reset. After these Resets, the
RABIF flag will continue to be set if a mismatch is
present.
Note:
The ANSELA register must be initialized
to configure an analog channel as a digital
input. Pins configured as analog inputs
will read ‘0’.
BANKSEL PORTA
;
CLRF
PORTA
;Init PORTA
BANKSEL ANSELA
;
CLRF
ANSELA
;digital I/O
BANKSEL TRISA
;
MOVLW
0Ch
;Set RA<3:2> as inputs
MOVWF
TRISA
;and set RA<5:4,1:0>
;as outputs
Note:
When a pin change occurs at the same
time as a read operation on PORTA, the
RABIF flag will always be set. If multiple
PORTA pins are configured for the inter-
rupt-on-change, the user may not be able
to identify which pin changed state.
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相關代理商/技術參數
參數描述
PIC16LF721-I/ML 功能描述:8位微控制器 -MCU 7 KB FLASH 256 B SRAM, 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC16LF721-I/P 功能描述:8位微控制器 -MCU 7 KB FLASH 256 B SRAM, 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC16LF721-I/SO 功能描述:8位微控制器 -MCU 7 KB FLASH 256 B SRAM, 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC16LF721-I/SS 功能描述:8位微控制器 -MCU 7 KB FLASH 256 B SRAM, 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC16LF721-I/SS 制造商:Microchip Technology Inc 功能描述:IC, 8BIT MCU, PIC16LF, 16MHZ, SSOP-20; Controller Family/Series:PIC16LF; Core Size:8 bit; No. of I/O's:18; Program Memory Size:7KB; RAM Memory Size:256Byte; CPU Speed:16MHz; Oscillator Type:External, Internal; No. of Timers:3 ;RoHS Compliant: No
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